JP2008284729A - Fiber-containing resin pellet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of fiber-containing resin pellets which can avoid the breakage and cutting of fibers to ensure sufficient mechanical strengths, can adapt itself to both a fiber having a short fiber length and a fiber having a long fiber length, can restrain the equipment cost and can prevent the degradation of a resin by heat. <P>SOLUTION: The manufacturing method of the fiber-containing resin pellets comprises the step of forming a fiber-compounded film 9 by hot-pressing two sheets of the resin films 1A and 1B while the fiber 2 is sandwiched between them and the step of cutting the fiber-compounded film 9, to form the pellets 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fiber-containing resin granulated product suitably used as, for example, a masterbatch for a fiber-reinforced resin molded article and a method for producing the same.

  In this specification and claims, the term “film” is used to include a sheet.

  Conventionally, in order to improve the mechanical strength of a thermoplastic resin, a fiber such as glass fiber or carbon fiber is often contained in the resin. Such a fiber-containing thermoplastic resin composition has been produced by putting fibers and a thermoplastic resin into an extruder, heat-kneading with an extrusion screw, and then extruding to pelletize.

  However, when heated and kneaded with an extrusion screw as described above, fiber breakage and cutting occur significantly due to the strong shearing force generated by the rotation of the screw, so that the mechanical strength of the molded product can be sufficiently improved. There was a problem that I could not.

As a method for solving such a problem, there is a method for producing a fiber reinforced resin molded material by drawing a continuous fiber bundle into an impregnation die filled with a molten resin and passing it through a nozzle at the tip of the impregnation die. It has been proposed (see Patent Documents 1 and 2). According to such a method (also referred to as a pultrusion method), there is no process in which a strong shearing force by an extrusion screw is applied to the fiber, so that the fiber is not broken or cut.
JP-A-8-80576 JP-A-10-52820

  However, the production by the conventional pultrusion method has a step of drawing the fiber into the impregnation die, and the span of continuous production depends on the fiber length. For example, it is applied when using a fiber having a relatively short fiber length. However, when a fiber having a medium fiber length is used, there is a problem that the productivity is poor even if the production is possible. That is, there is a restriction that it can be applied only when a fiber having a long fiber length is used.

  Further, in the pultrusion method, it is necessary to manufacture an impregnation die having a complicated shape, which causes a problem that the equipment cost increases.

  Further, in the pultrusion method, since the resin is retained in the impregnation die in a heated state for a long time, there is a problem that the resin is likely to be deteriorated by heat.

  The present invention has been made in view of such a technical background, and can be applied to both a fiber having a short fiber length and a fiber having a long fiber length while avoiding the bending and cutting of the fiber and ensuring sufficient mechanical strength. It is an object of the present invention to provide a method for producing a fiber-containing resin granulated product, which can reduce the equipment cost and prevent deterioration of the resin due to heat.

  In order to achieve the above object, the present invention provides the following means.

[1] A step of obtaining a fiber composite film by hot pressing a resin film having fibers attached to at least one side;
And a granulating step of obtaining a granulated product by cutting the fiber composite film. A method for producing a fiber-containing resin granulated product, comprising:

[2] A step of obtaining a fiber composite film by hot pressing two resin films with the fibers sandwiched therebetween,
And a granulating step of obtaining a granulated product by cutting the fiber composite film. A method for producing a fiber-containing resin granulated product, comprising:

  [3] The method for producing a fiber-containing resin granule according to item 1 or 2, wherein in the granulation step, the fiber composite film is cut to obtain a sheet-like granule having a long diameter of 2 to 30 mm.

  [4] The method for producing a fiber-containing resin granule according to any one of items 1 to 3, wherein the resin film / fiber mass ratio in the fiber composite film is in the range of 5/95 to 95/5.

  [5] The method for producing a fiber-containing resin granule according to any one of items 1 to 4, wherein a glass fiber is used as the fiber.

  [6] A fiber-containing resin granulated product produced by the production method according to any one of items 1 to 5.

  [7] The fiber-containing resin granulated product as described in 6 above, which is used as a master batch for a fiber-reinforced resin molded article.

  In the invention of [1], since there is no process in which a strong shearing force by the extrusion screw is applied to the fiber, fiber breakage and cutting are prevented. Therefore, the fiber reinforced resin molded product molded using the granulated product obtained by this production method can obtain sufficient mechanical strength. Further, there is no process of drawing the fiber into the impregnation die, and it can be dealt with by attaching the fiber to at least one surface of the resin film. Therefore, it is possible to apply a fiber having a short fiber length or a fiber having a long fiber length. Moreover, since it is not necessary to manufacture an impregnation die having a complicated shape, the equipment cost can be relatively low. Moreover, it is only necessary to hot press the resin film with the fibers attached, and since the resin does not stay in the impregnation die in a heated state for a long time as in the prior art, it is possible to prevent thermal deterioration of the resin. . Moreover, since the fiber and the resin film are combined by hot pressing, the fiber can be contained at a high concentration. Moreover, since the granulated product is obtained by cutting the fiber composite film obtained by hot pressing, the outer surface of this granulated product is coated with a resin, and this makes the handling property good. Dropping of fibers from the granulated product is sufficiently prevented, and the working environment can be sufficiently improved.

  In the invention of [2], since there is no process in which a strong shearing force by the extrusion screw is applied to the fiber, fiber breakage and cutting are prevented. Therefore, the fiber reinforced resin molded product molded using the granulated product obtained by this production method can obtain sufficient mechanical strength. Also, there is no process of drawing the fiber into the impregnation die, and it can be handled by hot pressing two resin films with the fiber sandwiched between them, so that either a short fiber or a long fiber can be used. Can be applied. Moreover, since it is not necessary to manufacture an impregnation die having a complicated shape, the equipment cost can be relatively low. Moreover, it is only necessary to heat press the two resin films with the fibers sandwiched between them, and the resin does not stay in the impregnation die in a heated state for a long time as in the prior art. The thermal deterioration of can also be avoided. Moreover, since the fiber and the resin film are combined by hot pressing, the fiber can be contained at a high concentration. Moreover, since the granulated product is obtained by cutting the fiber composite film obtained by hot pressing, the outer surface of this granulated product is coated with a resin, and this makes the handling property good. Dropping of fibers from the granulated product is sufficiently prevented, and the working environment can be sufficiently improved.

  In the invention of [3], since it is cut to obtain a thin plate-like granulated product having a major axis of 2 to 30 mm, it is possible to produce a granulated product having superior handling properties.

  In the invention of [4], since the mass ratio of the resin film / fiber in the fiber composite film is in the range of 5/95 to 95/5, the fiber and the resin of the resin film are combined in a more uniform state. Can do.

  The invention of [5] uses glass fibers as the fibers. In the conventional method in which fibers and thermoplastic resin are put into an extruder and heated and kneaded with an extrusion screw, glass fibers are used as the fibers. Even when glass fibers are used, breakage and cutting of the fibers are sufficiently prevented, and the improvement effect of mechanical strength due to the occurrence of such bending and cutting of the glass fibers is compared with the conventional method. And is very prominent.

  In the invention of [6], a fiber-containing resin granulated product capable of forming a fiber-reinforced resin molded article excellent in mechanical strength is provided.

  In the invention of [7], a fiber-containing resin granulated masterbatch capable of forming a fiber-reinforced resin molded article having excellent mechanical strength is provided. That is, a fiber-reinforced resin molded article having excellent mechanical strength can be produced by using the granulated product master batch further mixed with a resin.

  The method for producing a fiber-containing resin granule according to the present invention includes a step of obtaining a fiber composite film by hot pressing a resin film having fibers attached to at least one side, and cutting the fiber composite film. And a granulating step for obtaining a granulated product.

  According to the above manufacturing method, there is no process in which a strong shearing force is applied to the fiber, so that the fiber is prevented from being broken or cut. Further, there is no process of drawing the fiber into the impregnation die, and it can be dealt with by attaching the fiber to at least one surface of the resin film. Therefore, it is possible to apply a fiber having a short fiber length or a fiber having a long fiber length. Further, since it is not necessary to manufacture an impregnation die having a complicated shape as in the prior art, the equipment cost can be relatively low. In addition, it is only necessary to hot press the resin film with the fibers attached, and since the resin does not stay in the impregnation die in a heated state for a long time as in the prior art, thermal deterioration of the resin can be avoided. . Moreover, since the fiber and the resin film are combined by hot pressing, the fiber can be contained at a high concentration. Moreover, since the granulated product is obtained by cutting the fiber composite film obtained by hot pressing, the outer surface of this granulated product is coated with a resin. It is also possible to sufficiently prevent the fibers from falling off the object.

  In the cutting operation for obtaining a granulated product, only a small part of the fibers in the fiber composite film can be cut at the cutting site. Compared to this, it is much less. That is, in the prior art, most fibers are cut by the strong shearing force of the extrusion screw.

  The manufacturing method of this invention is demonstrated in detail based on the following 1st-3rd embodiment.

[First Embodiment]
As shown in FIG. 1, the resin film (1A) wound up in a roll shape is pulled out horizontally, and fibers (1) are transferred from the belt conveyor (3) to the upper surface of the resin film (1A) transferred horizontally. 2) is sprayed. After superposing the resin film (1B) pulled out from the roll state on the upper surface of the resin film (1A) on which the fibers (2) are dispersed on the upper surface in this way, they are preheated by the preheating heater (4). . Thereafter, the two resin films (1A) and (1B), which are superposed on each other with the fiber (2) sandwiched therebetween, are hot-pressed by a hot press machine (5), whereby a fiber composite film (9 ) Next, the obtained fiber composite film (9) is cut longitudinally and laterally with a cutter (cutting machine) (6) to obtain a thin plate-like granulated product (7) made of a fiber-containing resin. In FIG. 1, (8) is a belt conveyor for conveyance. In the manufacturing method according to the first embodiment, the granulated product (7) can be manufactured while continuously supplying the two resin films (1A) and (1B), which is excellent in productivity.

[Second Embodiment]
As shown in FIG. 2, the resin film (11A) is extruded from the first extruder (14A) and supplied between the pair of heat rolls (15) (15), while the resin film ( 11B) is extruded and supplied between the pair of heat rolls (15) and (15), and the fibers (12) are dropped between these resin films (11A) and (11B) and dispersed. The spreading of the fibers (12) is performed by dropping the fibers (12) from the belt conveyor (13) at the uppermost position into a guide tube (20) extending in the vertical direction. Thereafter, the two resin films (11A) and (11B) are hot-pressed with a pair of hot rolls (15) and (15) in a state where the fibers (12) are sandwiched, whereby a fiber composite film (19) is obtained. obtain. Next, the obtained fiber composite film (19) is cut longitudinally and laterally with a cutter (cutting machine) (16) to obtain a thin plate-like granulated product (17) made of a fiber-containing resin. In FIG. 2, (18) is a belt conveyor for conveyance. Since the granulated product (17) can be manufactured while supplying the two resin films (11A) and (11B) in a continuous manner, the manufacturing method of the second embodiment is excellent in productivity.

[Third Embodiment]
As shown in FIG. 3, the resin film (21A) is extruded from the first extruder (24A) and supplied between the pair of heat rolls (25) (25), while the resin film ( 21B) is extruded and supplied between the pair of heat rolls (25) (25), and a plurality of continuous rolls drawn from each fiber roving (23) are provided between the resin films (21A) (21B). Fiber (22) is supplied. Thereafter, the two resin films (21A) and (21B) are hot-pressed with a pair of hot rolls (25) and (25) in a state where the continuous fibers (22) are sandwiched therebetween, whereby a fiber composite film (29) is obtained. Get. Next, the obtained fiber composite film (29) is cut in the vertical and horizontal directions with a cutter (cutting machine) (26) to obtain a sheet-like granulated product (27) made of a fiber-containing resin. In FIG. 3, (28) is a belt conveyor for conveyance. Since the manufacturing method of this 3rd Embodiment can manufacture a granulated material (27), supplying two resin films (21A) (21B) and a fiber (22) continuously, it is excellent in productivity. .

  In the present invention, the fibers (2), (12), and (22) used as production raw materials are not particularly limited, and examples thereof include glass fibers, carbon fibers, synthetic resin fibers, and inorganic compound fibers.

  Although it does not specifically limit as said glass fiber, For example, a glass long fiber, the chopped strand of glass fiber, etc. are mentioned. The glass fiber is usually subjected to surface treatment for the purpose of improving handling and improving the adhesion of the resin film to the resin. Examples of the treating agent for the surface treatment include a copolymer of an unsaturated carboxylic acid and an unsaturated monomer, a silane coupling agent, and the like. Examples of the unsaturated carboxylic acid constituting the copolymer include acrylic acid and methacrylic acid. Examples of the unsaturated monomer constituting the copolymer include ethylene, propylene, styrene, and acrylate. And methacrylic acid esters. Examples of the silane coupling agent include vinyltriethoxysilane and γ-glycidoxypropyltriethoxysilane.

  The synthetic resin fiber is not particularly limited, and examples thereof include an aramid fiber, a polyarylate fiber, a polyparaphenylene benzobisoxazole fiber, and a polyimide fiber.

  Further, the inorganic compound fiber is not particularly limited. For example, wollastonite fiber, potassium titanate fiber, MOS (basic magnesium sulfate) fiber, aluminum borate fiber, calcium carbonate fiber, carbon fiber, basalt Examples thereof include fibers.

  The fiber length of the fibers (2), (12), and (22) is not particularly limited, and any length can be used.

  The resin used for the resin films (1A) (1B) (11A) (11B) (21A) (21B) is not particularly limited. For example, polyethylene, polypropylene, polyethylene terephthalate (PET), poly Butylene terephthalate (PBT), polyamide, polystyrene, AS resin (acrylonitrile-styrene copolymer resin), ABS resin (acrylonitrile-butadiene-styrene copolymer resin), modified PPE (modified polyphenylene ether), polycarbonate, POM (polyacetal) And other thermoplastic resins.

  The resin film may contain additives such as a colorant, an improving material, and a filler other than fibers.

  In the manufacturing method of this invention, it is preferable that the thickness of the resin films (1A) (1B) (11A) (11B) (21A) (21B) is set in the range of 20 to 300 μm.

  In addition, the means for performing the hot press is not particularly limited, and examples thereof include a hot press and a hot roll. Although the heating temperature at the time of this hot pressing varies depending on the type of resin constituting the resin film, it is usually preferably set in the range of 100 to 300 ° C.

  The mass ratio of resin film / fiber in the fiber composite film is preferably set to be in the range of 5/95 to 95/5. As the content ratio of the resin film becomes larger than the lower limit value, the fiber and the resin of the resin film can be combined in a uniform state, and the content ratio of the resin film becomes smaller than the upper limit value so that it can be used as a master batch. Can be used. Especially, it is especially preferable to set so that the resin film / fiber mass ratio in the fiber composite film is in the range of 10/90 to 50/50.

  The alignment state of the fibers (2), (12), and (22) in the fiber composite films (9), (19), and (29) is not particularly limited, and may be any alignment state. That is, the disordered alignment state as shown in FIG. 5A or the alignment state aligned in one direction as shown in FIG. When the latter is in an aligned state in one direction, it is preferable to obtain a granulated material by cutting it into a long rectangular shape in the fiber length direction as shown in FIG. 5 (b). The proportion of fibers that are produced can be further reduced.

  In addition, the means (6), (16), and (26) for cutting (cutting) the fiber composite films (9), (19), and (29) are not particularly limited, but a cutter that can cut in the vertical and horizontal directions (cutting) Is preferably used.

  Moreover, it is preferable to obtain a sheet-like granulated product (7) (17) (27) having a major axis (L) of 2 to 30 mm by cutting the fiber composite film (9) (19) (29) (FIG. 4 (b)). When the long diameter (L) is 2 mm or more, the handleability of the granulated product can be improved, and when the long diameter (L) is 30 mm or less, supply stability to the molding machine can be secured. Especially, it is especially preferable that the long diameter (L) of the said granule (7) (17) (27) of the said thin plate piece is the range of 3-15 mm. Further, the thickness (T) of the thin plate-like granulated product (7) (17) (27) is usually in the range of 0.05 to 3 mm (see FIG. 4 (a)).

  In addition, in the said embodiment, although it was made to obtain the granulated material (7) (17) (27) of planar view substantially rectangular shape by a plan, the shape of a granulated material is specifically limited to such a shape. It is not a thing.

  Thus, when a fiber-reinforced resin granulated product (7) (17) (27) obtained by the above production method is molded, the fiber-containing resin granulated product is molded as it is. A fiber reinforced resin molded product may be molded using as a material, or a fiber reinforced resin molded product may be molded using a mixture of this fiber-containing resin granulated master batch and a thermoplastic resin as a molding material. May be.

  The method for producing a fiber-containing resin granulated product according to the present invention is not particularly limited to that of the above-described embodiment, and any design changes can be made within the scope of the claims as long as they do not depart from the spirit. Is also acceptable.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

<Example 1>
As shown in FIG. 1, a 100 μm thick LDPE film (low density polyethylene) (1A) wound up in a roll shape is pulled out horizontally, and on the upper surface of the horizontally transferred film (1A), Glass fiber chopped strands (strand length 3 mm) (2) are sprayed from the belt conveyor (3). After the LDPE film (1B) having a thickness of 100 μm drawn from the roll state was superposed on the upper surface of the LDPE film (1A) on which the glass fibers (2) were dispersed on the upper surface in this manner, ) To preheat. Thereafter, two films (1A) and (1B), which are superposed on each other with the glass fiber (2) sandwiched therebetween, are hot-pressed at 200 ° C. with a hot press machine (5) to form a fiber composite. A film (9) was obtained. Next, the obtained fiber composite film (9) was cut longitudinally and laterally with a cutter (6) to obtain a thin plate-like granulated product (7) made of a fiber-containing resin. That is, a granulated product (7) as shown in FIG. 4 (a) made of a square thin plate piece (E = 15 mm, F = 15 mm, thickness T = 1 mm, major axis L = 21 mm) having a side length of 15 mm. )

<Examples 2 to 11>
Except that the conditions (composition, film thickness, hot press temperature) as shown in Tables 1 and 2 were set, a thin plate-like granulated product made of a fiber-containing resin was obtained in the same manner as in Example 1.

  The granulation property of the granulated product obtained as described above was evaluated based on the following evaluation method. Moreover, the ash content (glassy component) of the granulated material was determined by the following measurement method.

<Granulation property evaluation method>
“○”: The fiber does not fluff on the surface of the granulated material, and the fiber does not fall off. “X”: The fiber is fluffed on the surface of the granulated material, the handling property is poor, and the fiber is also likely to fall off .

<Method for measuring ash content of granulated product>
The granulated product was put in a crucible, and this was heated and burned at 600 ° C. for 3 hours in an electric furnace, and then weighed, and the ash content was determined by the following formula.

Ash content (%) = (mass of residue after combustion / mass of granulated material before combustion) × 100
As is clear from Tables 1 and 2, the granulation properties were good in any of Examples 1 to 11. In addition, the granulated products of Examples 1 to 5, 8, and 9 have a very high ash (glassy component) ratio, and it becomes possible to produce a fiber-containing resin granulated product containing fibers at a high content rate. I understood.

<Example 12>
Injection molding was performed using a mixture (glass fiber content of 15% by mass) in which 83.5 parts by mass of maleic anhydride-modified polypropylene was mixed with 16.5 parts by mass of the granulated product (master batch) obtained in Example 3. By performing, the fiber reinforced resin molding was obtained.

<Comparative Example 1>
By extruding a mixture of 85 parts by mass of maleic anhydride-modified ethylene propylene copolymer and 15 parts by mass of chopped strands of glass fibers (strand length 3 mm) with a single screw extruder and pelletizing the mixture. A plate-like fiber-reinforced resin molded body was obtained.

<Example 13>
Injection molding was performed using a mixture (glass fiber content of 15% by mass) in which 81.8 parts by mass of polyethylene terephthalate (PET) was mixed with 18.2 parts by mass of the granulated product (master batch) obtained in Example 5. By performing, the plate-shaped fiber reinforced resin molding was obtained.

<Comparative example 2>
A mixture of 85 parts by mass of polyethylene terephthalate (PET) and 15 parts by mass of chopped strands of glass fiber (strand length: 3 mm) was extruded using a single screw extruder and pelletized by injection molding to obtain a plate-like shape. A fiber-reinforced resin molded product was obtained.

<Example 14>
Injection molding was carried out using a mixture (aramid fiber content 15% by mass) in which 81.2 parts by mass of polyethylene terephthalate (PET) was mixed with 18.8 parts by mass of the granulated product (master batch) obtained in Example 10. By performing, the plate-shaped fiber reinforced resin molding was obtained.

<Comparative Example 3>
A fiber reinforced resin in the form of a plate by injection molding a mixture of 85 parts by mass of polyethylene terephthalate (PET) and 15 parts by mass of aramid fibers (fiber length 6 mm) kneaded by a single screw extruder and pelletized. A molded body was obtained.

<Example 15>
Injection molding was performed using a mixture (carbon fiber content of 15% by mass) in which 81.2 parts by mass of polyethylene terephthalate (PET) was mixed with 18.8 parts by mass of the granulated product (master batch) obtained in Example 11. By performing, the plate-shaped fiber reinforced resin molding was obtained.

<Comparative Example 4>
A plate-like fiber reinforced resin is obtained by injection molding a mixture of 85 parts by mass of polyethylene terephthalate (PET) and 15 parts by mass of carbon fiber (fiber length 6 mm) kneaded with a single screw extruder and pelletized. A molded body was obtained.

  The characteristics of each fiber reinforced resin molded article obtained as described above were measured based on the following measurement method.

<Charpy impact strength measurement method>
Charpy impact strength (kJ / m ² ) was measured according to JIS K7111-1996.

<Bending strength measurement method>
The bending strength (MPa) was measured according to JIS K7171-1994.

<Bending elastic modulus measurement method>
The flexural modulus (MPa) was measured according to JIS K7171-1994.

  As is apparent from Tables 3 to 6, the fiber-reinforced resin molded product molded using the granulated product obtained by the production method of the present invention is a conventional method (kneaded fiber and resin with an extruder). Compared with the fiber-reinforced resin molded article obtained by the granulating method), the resin had excellent mechanical strength.

  The fiber-containing resin granulated product obtained by the production method of the present invention is used as a molding material for a fiber reinforced resin molded product such as a fiber reinforced resin injection molded product, and particularly, a fiber reinforced resin molded product (fiber reinforced resin). Although it is suitably used as a master batch for a resin injection molded article or the like, it is not particularly limited to such a use.

It is a schematic side view which shows 1st Embodiment of the manufacturing method which concerns on this invention. It is a schematic side view which shows 2nd Embodiment of the manufacturing method which concerns on this invention. It is a schematic side view which shows 3rd Embodiment of the manufacturing method which concerns on this invention. It is a figure which shows an example of the fiber containing resin granulation obtained by the manufacturing method of this invention, Comprising: (a) is a perspective view, (b) is a top view. It is a top view which shows the example of the orientation state of the fiber in a fiber containing resin granulation, Comprising: (a) is a top view which shows the orientation state of the fiber of the granulation obtained by 1st and 2nd embodiment, ( b) is a plan view showing the orientation state of the fibers of the granulated product obtained in the third embodiment.

Explanation of symbols

1A, 1B ... resin film 2 ... fiber 5 ... heat press 6 ... cutter 7 ... granulated product 9 ... fiber composite film 11A, 11B ... resin film 12 ... fiber 15 ... heat roll 16 ... cutter 17 ... granulated product 19 ... Fiber composite film 21A, 21B ... Resin film 22 ... Fiber 25 ... Heat roll 26 ... Cutter 27 ... Granulated material 29 ... Fiber composite film

Claims (7)

A step of obtaining a fiber composite film by hot-pressing a resin film having fibers attached to at least one side;
And a granulating step of obtaining a granulated product by cutting the fiber composite film. A method for producing a fiber-containing resin granulated product, comprising: A step of obtaining a fiber composite film by hot pressing two resin films with a fiber sandwiched therebetween,
And a granulating step of obtaining a granulated product by cutting the fiber composite film. A method for producing a fiber-containing resin granulated product, comprising:   The method for producing a fiber-containing resin granulated product according to claim 1 or 2, wherein in the granulating step, the fiber composite film is cut to obtain a thin plate-like granulated product having a major axis of 2 to 30 mm.   The method for producing a fiber-containing resin granulated product according to any one of claims 1 to 3, wherein a mass ratio of resin film / fiber in the fiber composite film is in a range of 5/95 to 95/5.   The manufacturing method of the fiber containing resin granulation of any one of Claims 1-4 which uses glass fiber as the said fiber.   A fiber-containing resin granulated product produced by the production method according to any one of claims 1 to 5.   The fiber-containing resin granulated product according to claim 6, which is used as a masterbatch for a fiber-reinforced resin molded article.

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